How Drawing a Picture Can Help you Get More GMAT CR Correct!

Take a look at this Critical Reasoning question from 1000 CR:

Archaeologists seeking the location of a legendary siege and destruction of a city are excavating in several possible places, including a middle and a lower layer of a large mound. The bottom of the middle layer contains some pieces of pottery of type 3, known to be from a later period than the time of the destruction of the city, but the lower layer does not.

The force of the evidence cited above is most seriously weakened if which of the following is true?

(A) Gerbils, small animals long native to the area, dig large burrows into which objects can fall when the burrows collapse.
(B) Pottery of types 1 and 2, found in the lower level, was used in the cities from which, according to the legend, the besieging forces came.
(C) Several pieces of stone from a lower-layer wall have been found incorporated into the remains of a building in the middle layer.
(D) Both the middle and the lower layer show evidence of large-scale destruction of habitations by fire.
(E) Bronze ax heads of a type used at the time of the siege were found in the lower level of excavation.

This one is interesting since we are not provided with a conclusion, so we have to draw one based on the evidence.

Evidence: Bottom of middle layer contains pottery 3. Pottery 3 is made AFTER the destruction.

I’m going to draw a picture, because drawing is fun, and totally under-rated when it comes to GMAT Critical Reasoning. đź™‚

We can infer that usually the deeper the level = the older the time period. Since as we move forward in time, we generally build up on things.

So, the city was probably destroyed around the lower layer, or in the middle layer but beneath where the pottery was found.

Question: What casts doubt on the Type 3 pottery in the middle layer/destruction of city inference?

Prediction: If the pottery was moved around — if the location doesn’t represent the time period accurately.

A – decent choice, shows pottery could’ve been moved
B – doesn’t comment on Type 3 pottery
C – this implies at some point the middle-layer people used the wall below them to build up — but doesn’t show that the pottery could have moved down or up
D – Fire is totally irrelevant
E – “at the time of the siege” is vague — and this doesn’t relate at all to the pottery evidence

GMAT CR: “Strengthen” Question of the Day!

A broken shard of glass found in the laboratory of the famed physicist Alhazen has a polished surface that separates out the green and blue spectrums of white light, a key characteristic of a dispersive prism, which separates white light into all its constituent spectral components. Scientific historians, based on this finding, are revising their histories in order to give Alhazen, the â€śfather of modern optics,â€ť credit for the discovery of the dispersive prism, which was thought to have been discovered many years later.

Which of the following, if true, most strongly supports the historiansâ€™ decision to revise the history of optics?

A. Dispersive prisms were the only type of prism that was theorized about in the scientific era in which Alhazen lived.

B. The piece of glass from which the shard broke, if unbroken, would have been just large enough to separate out the entire spectrum of white light into its spectral components.

C. The piece of glass was a combination of flint glass, which was known to have been used by Alhazen to craft lenses in his laboratory, and crown glass, another popular type of glass throughout history.

D. Dispersive prisms are the simplest and most common objects that are able to divide white light into its constituent spectral components.

E. Several glass objects that are known to have some properties of a dispersive prism have been found to be older than the glass piece in Alhazenâ€™s laboratory.

Explanation:

Conclusion: Historians give A credit for prism.

Evidence: Glass found that has characteristic of prism.

Assumption: Glass not there by accident; glass definitely means A “discovered” prism.

Question: What STRENGTHENS?

Prediction: Anything that links this glass to the prism, removes coincidence.

A – Other prisms out of scope.
B – This connects the glass to the prism.
C – The type of glass is irrelevant.
D – This is just a fact about the prism.
E – This would weaken, since it makes the glass/prism link less strong.

GMAT CR: “Resolve the Argument” Practice Question

In September of last year, the number of people attending movies in theatres dropped precipitously. During the next few weeks after this initial drop the number of film-goers remained well below what had been the weekly average for the preceding year. However, the total number of film-goers for the entire year was not appreciably different from the preceding year’s volume.

Which of the following , if true, resolves the apparent contradiction presented in the passage above ?

A) People under the age of 25 usually attend films in groups,rather than singly.
B) The gross income from box office receipts reamined about the same as it had been the preceding year.
C) For some portion of last year , the number of people attending movies in theaters was higher than it had been during the previous year .
D) The number of people attending movies in theaters rises and falls in predictable cycles .
E) The quality of films released in September and October of last year was particularly poor.

Explanation:

– In Sept, # of attendees dropped
– In Oct, # of attendees stayed below previous year’s weekly avg
– TOTAL number of filmgoers was not different from previous year

Question: How come?

Prediction: The months outside of Sept/Oct made up for the drop & allowed the year to remain consistent

A – irrelevant
B – irrelevant, we’re talking filmgoers not \$\$
C – boom, matches our prediction!
D – potentially, but more vague than C
E – irrelevant, we’re talking # of people not quality

Clearly it comes down to C and D. C is my choice since it most closely matches our prediction.

Learnist: GMAT Critical Reasoning Overview

The Verbal section of the GMAT consists of 41 questions that you must complete in 75 minutes. Critical Reasoning is one of three Verbal question types you’ll see on Test Day!

In this video, Abi from GMAXOnline reviews the basic format of CR questions, discusses what an argument is, and the parts of the argument: premises, conclusions, assumptions, inferences. She also covers some of the common keywords to look out for on this question type!

As you can see in this video, there are more than half a dozen question-types. Always determine what type of CR question it is by reading the question stem first. This 3-step method is a general guideline for all the CR question types.

This is a “weaken” questions as shown by the phrase “would most weaken.” Weakening questions are one of the most common CR question-types.

Check out more practice Critical Reasoning questions on Learnist!

GMAT CR: “Weaken” Question of the Day!

Try out this medium-level “weaken” question from GMAT Hacks!

Industry analysts feel that Bluecorp paid far too much to acquire rival fiÂ…rm Strickland. While doing so limited competition they face in the marketplace, this approach cannot be proÂ…table in the long
run. Once two rival fiÂ…rms merge in order to increase proÂ…ts, the higher prices would only provide other competitors an opportunity to enter the Â…field at a lower price, cutting into Bluecorp’s proÂ…fits
and making the acquisition of Strickland an expensive mistake.

Which of the following, if true, most seriously weakens the
argument?

(A) In some countries it is legal for two companies to merge
even if the resulting entity would nearly monopolize the
market.

(B) The combination of Bluecorp and Strickland creates an
entity whose size allows it to produce items at a far lower
cost than could any smaller enterprise.

(C) In addition to eliminating competition, Bluecorp’s
acquisition gives it a much more substantial presence
in urban areas.

(D) As a result of the acquisition, the new corporate entity
will create two smaller entities to operate as independent
suppliers to Bluecorp.

(E) When two large companies in the same Â…field combine,
entrepreneurs tend to shy away from the fiÂ…eld due to the
single entity’s perceived dominance.

-Conclusion: Bluecorp acquiring Strickland = NOT profitable long-term
(author concedes it DID limit competition)

-Evidence: Higher prices gives competitors opportunity

-Assumption: That the merger = higher prices

The question asks which answer choice would “weaken” the argument, so my prediction is something that shows the merger resulting in LOWER prices for Bluecorp.

Let’s look at the choices:

(A) The legality of the merger is irrelevant to the argument
(B) This correctly weakens the argument! “Lower cost” correctly refutes the “higher prices” in the assumption.
(C) Bluecorp’s presence in urban areas is irrelevant to the argument.
(D) Independent suppliers are irrelevant to the argument.
(E) The focus here is on the entrepreneurs “shying away” – it doesn’t weaken the argument, which focuses on the merger = higher prices.

GMAT CR: “Strengthen” Question of the Day

Try this Critical Reasoning “strengthen” question from the GMAT Official Guide 12th Edition on your own! Then scroll down for an answer and explanation!

The pharmaceutical industry argues that because new drugs will not be developed unless heavy development costs can be recouped in later sales, the current 20 years of protection provided by patents should be extended in the case of newly developed drugs. However, in other industries new-product development continues despite high development costs, a fact that indicates that the extension is unnecessary.

Which of the following, if true, most strongly supports the pharmaceutical industryâ€™s argument against the challenge made above?

(A) No industries other than the pharmaceutical industry have asked for an extension of the 20-year limit on patent protection.
(B) Clinical trials of new drugs, which occur after the patent is granted and before the new drug can be marketed, often now take as long as 10 years to complete.
(C) There are several industries in which the ratio of research and development costs to revenues is higher than it is in the pharmaceutical industry.
(D) An existing patent for a drug does not legally prevent pharmaceutical companies from bringing to market alternative drugs, provided they are sufficiently dissimilar to the patented drug.
(E) Much recent industrial innovation has occurred in products-for example, in the computer and electronics industries-for which patent protection is often very ineffective.

Let’s look at our analysis!

Conclusion: The extension is unnecessary (the 20yr protection doesn’t need to be continued)

Evidence: New-product development continues despite high dev costs in other industries

Assumptions: That there isn’t some reason the pharmaceutical industry is diff. from other industries

The question asks which would support the pharmaceutical industry’s argument. In other words, what would WEAKEN our author’s argument. My prediction is something that shows the pharmaceutical industry is diff. from other industries, and that somehow the trends of other new-product development doesn’t apply to it.

Now let’s review the answer choices:

(A) What other industries have done is irrelevant.
(B) The length of time involving clinical trials would show what sets the pharmaceutical industry apart. Correct!
(C) This would seem to actually support the argument.
(D) Irrelevant to the argument.
(E) This choice does not show why the pharmaceutical industry NEEDS the extension – it just comments that for other industries, patents are ineffective. In a way, this seems to be the opposite of what we are looking for – the assumption being if these other industries don’t need a patent, then the pharmaceutical industry might not need one.

GMAT CR: “Weaken” Practice Question!

Try this “Weaken” question — remember to take notes on the passage, then compare them to mine!

Although the organic farms in the agricultural community of Greendale are destined to shut down within the next decade as a result of competition from the organic mega-farm Full Foods, the farmland will not go unused for long. In the decade since the opening of OmniFoods, Inc., a non-organic farm conglomerate, a new owner has bought and reopened every farm in Greendale that has shut down due to competition with OmniFoods, Inc.

Which of the following, if true, most seriously weakens the argument?

A. Many customers of OmniFoods, Inc. are expected to buy less nonorganic food than they did before the Full Foods farm opened in Greendale.
B. The new farms that have opened in the agricultural community of Greendale since OmniFoods, Inc. opened have been primarily organic farms.
C. Many farms in Greendale sell produce that is not available to buy from either OmniFoods, Inc. or from Full Foods.
D. The demand for organic food is expected to increase at a faster rate over the next decade than at any time over the past fifty years.
E. The agricultural community of Greendale currently has more different farms operating within its borders than it ever has before

Here’s how to break this one down!

Conclusion: Farmland will not go unused when small farms shut down.

Evidence: Omnifoods precedent

Assumption: What is true for non-organic Omni is true for organic Full Foods.

Question: What WEAKENS?

Prediction: If there is a difference between Full Foods & Omni’s practices

A – customers are irrelevant
B – shows a difference
C – farmland could still be used regardless of what is sold
D – demand is irrelevant
E – change in diff types of farms over time is irrelevant

GMAT Success Stories – Get Inspired!

Occasionally, I like to post some “GMAT Success Stories” — cool, first-person accounts of how others have rocked their GMAT. One of my favorite sayings is that success leaves footprints, and it’s 100% true! Most of these “success stories” come from the awesome site Beat the GMAT. I’ll try to post some of my favorites! Today’s is reposted here from Brett, a former student of mine.

Hope you enjoy!

My 700 & awesome tips to make it happen. You’re welcome

I officially started my GMAT preparation in November of â€™11. Here is a little background about me Iâ€™m a white male 27 years old. Iâ€™m originally from Boston but have lived everywhere from Barcelona, to South Beach, to my current residence in Las Vegas, Nevada. I have a very friendly and outgoing personality and have held very unconventional jobs such as being a professional online poker player, a personal trainer/model, etc.

Since I was not carrying a job at the moment I studied for the GMAT around the clock for a month, I viewed it kind of like a poker game always searching for that advantage, that edge. Poker will be a theme throughout this post because I come from a high-stakes poker background and I brought a lot of those transferable skills to my GMAT preparation. I had the Official Guide, the blue and green books (Math/Verbal Review). On my 1st attempt I strolled into my testing center which was hilariously right on the Strip in Las Vegas and crashed out with a mediocre 590. I was not happy. What does a smart person do after a setback? He/she continues to work hard but also examines their approach/strategy.

Strategy Tips: Sentence Correction

The key to the Verbal Section revolves around Sentence Correction. If you want to have a great Verbal score your sentence correction has to be just lights out. You need to lean off of this section to support you throughout the entire verbal section and try to eliminate the potential for strings of incorrect answers. This is the most important part of the GMAT to make flashcards on. It is the area most largely represented on the Verbal Section and a spot you really need to be looking to actively bank time.

On another note, donâ€™t be one of those fools who tries to memorize every idiom, that is completely useless and a waste of time. The idioms arenâ€™t tested very often and unfortunately you have to kind of feel it out based on the meaning of the sentence. If you do miss an idiom however make sure to make a note of it on your own personal â€śIDIOMSâ€ť flashcard.

Here is the optimal way to approach sentence correction. As the Verbal tutorial ticks down (1 minute) as you prepare to begin this section, write ABCDE horizontally on the right side of you pad 4x on each of the 1st four pages you are going to use. Make them neat with slight spacing between the letters and leave space so the 4 arenâ€™t clustered on top of each other. It is optimal to write these keys on the right side because your Critical Reasoning and Reading Comprehension notes will naturally flow from left to right as you write, so keeping these sentence correction on the right will help keep you more organized and you wonâ€™t become flustered, where as you might if you do each question on a random part of the page. The key to success is being calm and organized and your scratch pad strategy should be no different. This move will save you time and keep you organized on the Verbal section which equals points.

Once you see an SC read A, you do the standard stuff look for errors. If you see one you snap cross it off and look for that error repeated in other answer choices. You only job when you read choice A is to do one of 3 things. You either cross it off if youâ€™re sure itâ€™s wrong and can identify a grammatical rule violation that proves it. You put a – (a minus sign) if you donâ€™t really like choice A but you canâ€™t see anything to eliminate it, and you right a + on top of answer choice A if you like it, and the sentence seems correct and clear. This move really takes the pressure off and allows you to find the worst choices first instead of having to make a strict yes/no judgment call on choice A Then a standard elimination strategy occurs, as you reach tougher SC questions this +/- system increases in value because it allows you to identify whether you kind of liked or didnâ€™t like an answer. Trust me in a pressured time situation you will basically instantly the forget the choice you just read and having that helpful +/- reminder can keep you on track as you approach the final couple of choices.

Stop doing sentence correction on feel. How committed are you to the GMAT? To the Verbal Section? To Sentence Correction? You can scrape by with knowing some subject verb agreement and avoiding the word â€śbeingâ€ť right? Wrong answer buddy, you need to build this thing from the ground up. If you canâ€™t tell me what the difference is between a gerund and participle right now or when it is correct to use â€śwould + verb root tenseâ€ť, youâ€™re just flat out not that serious about sentence correction. Iâ€™m giving a shout out right now to fellow Bostonians Dave and Jen whoâ€™s 4-part SC lesson on Knewton Prep is the best Iâ€™ve seen and really teaches you the underlying grammar structure of what you need to know. So stop just doing a bunch of SCs because even when you do ok and think youâ€™re â€śimprovingâ€ť as your time to completion decreases. I can assure you when test days comes and you use a little too much â€śfeelâ€ť on your practice tests when nothing was on the line, you will start breaking down on the real thing under the pressure. You will second guess yourself, you will spend time you canâ€™t afford to be spending which will prevent you from crushing. Trust me, I know this from experience. As a final note I was rather furious when I took my test yesterday to find 4 SCâ€™s that incorporated the use of dashes in the middle of the sentence, sometimes intertwined with the underlined portion. I had no formal training in how exactly to operate with all these dashed portions and this hurt my score a bit. Kinda feel like writing the GMAC a letter cursing them out, hah.

Ok, back to my journey. So after this score I wrote an email describing my experience to my family and a few close friends. Some people supported me, especially two of my closest friends. However my dad wrote me a vicious e-mail screaming at me about getting my life on track. I wonder if he would have wrote that had I came back with a great score? As we say in the poker community, it was a pretty â€śresults orientedâ€ť e-mail. After that I envisioned the day I could write a victorious and sarcastic e-mail with a great score and thanking everyone who supported me. So things were looking up, I studied hard night and day for the next month, and I purchased the Verbal Section of the GMAT Pill. The RC was great, the SC was good. The CR was some questions with random diagrams youâ€™d never actually have time to draw on the actual test and just wasnâ€™t very good (get POWERSCORE book for CR). When trying to improve at something itâ€™s never a bad idea to model/learn from the people who are the best. So I decided to book a coach, her name is Vivian Kerr (Grockit) sheâ€™s a Cali girl whoâ€™s a flat out stud at standardized tests so I decided to sign her to a long term deal.

Strategy Tips – Tutoring:

Provided you can afford it, itâ€™s never a bad idea to have a superstar in your corner to spot things you can improve and keep you real sharp. While its obviously important to attack your weak areas, its also important to note how a tutor approaches questions stylistically. Sometimes a tutor can help you find the best way for you to approach a question type, but sometimes figuring out what doesnâ€™t work for you is just as helpful. I talked to my tutor about specific areas but also strategies of what to study, and how to study most effectively. It was definitely helpful and got me thinking about things the right way.

Test Day Recap: I woke up at 8am and had a real chill morning, I flipped thru my flashcards I ate some cheerios and I watched a tennis match on TV. My roommate woke up at 12 like the tool that he is and we went to eat breakfast together at a diner. After this late breakfast I texted a few of my closest friends who had been supporting me through these hard times. Hereâ€™s a txt convo with me and one of my closest buddies.

Brett: Wake up George, itâ€™s judgment day
George: the bell tolls for thee
Brett: Haha, light a candle for me, Iâ€™ll call you at 8pst after it ends no matter what the score, love you baby, my time to shine
George: Fly like an angel Brett, itâ€™s too beautiful

Haha yeah weâ€™re pretty weird. After that I went to my desk and did 3 problems of each type just to warm up a bit. And since Iâ€™m being completely honest in this review at this risk of sounding like a lunaticâ€¦ for 10 minutes I paced around our house yelling things like â€śLets fkn ball, Iâ€™m bout to wreck shop, lets fkn goâ€ť or some combination of rallying phrases to psych myself up. Itâ€™s was like the 8 mile soundtrack â€śif you hadâ€¦one shotâ€ť This was my last shot.

I left for the test center at 2:45pm for my 4pm start giving myself plenty of time to hang out. Usually it takes 15 minutes to get to this testing center. There was a huge accident on the highway and I was forced to exit and enter the strip on the opposite side of where I needed to be I fought thru immense traffic and arrived at the testing center at 4:10pm. The guy informed me there was a 15 minute grace period and if I was 5 minutes later the appointment would have been cancelled, whew. Then there was some problem where these clowns on MBA.com copied down my birthday as 5-5 instead of 5-10 so they had to call in and get the green light.

I neglected to mention earlier that the one positive from my first GMAT attempt was I got 6.0 on both essays which isnâ€™t the easiest thing to do. I had decided beforehand to spend 15 minutes on each essay, to get a bit of a warm-up but I certainly wasnâ€™t going to expend any energy actually caring about what I wrote. The 1st question was â€śwhat has more influence in a nation or a community, a powerful business leader or a government officialâ€ť My first paragraph was entirely devoted to ripping on the question, claiming that this was the worst GMAT essay question Iâ€™d ever seen. â€śTo combine two vastly different entities such as an nation or community into a entity is downright ludicrous and makes this essay question the worst one Iâ€™ve ever laid eyes on.â€ť I was laughing at my own essay staying really loose and calm. The second essay involved me berating a business owner and more hilarity ensued. Whoever reads my essays are definitely going to be cracking up. I wrote personal messages at the end too, like â€śhey have a good weekend, god bless youâ€ť just random stuff like that.

It was all business on the math section I started off ripping, it was a battle between me and the GMAT. Iâ€™m pretty sure I snapped off 9 of the first 10 and after that I could feel the test start to get angrier and angrier that I was doing well. A huge bright spot for me was an area I worked very hard on and that was data sufficiency. One of the pointers I had gotten from my tutor was to spend a bit more time trying to break-down the prompt and not sprinting directly to the statements, this definitely pays a lot of dividends.

Strategy Tips Data Sufficiency:

Here is my best data-sufficiency tip, you wonâ€™t find it in an online course, or on a forum, or from your friend who took the GMAT last year, but Iâ€™m a big believer in it. Start with the easier/shorter statement! I do this every time. This just makes your life so much easier you get insight into the problem dealing with a much more basic statement. You build momentum and confidence if you can correctly analyze it too. Sometimes if itâ€™s sufficient you know the true answer to a value question, and although you obviously donâ€™t want to carry-over information. Knowing the real answer will help you look at the harder statement in a more intelligent fashion

Guessing Strategies: So back to the test, I was rolling thru with a gleam in my eye as the test continued. I ran into a long word problem-ish DS with a few complicated formulas which is definitely a weak spot of mine. I practice what I preach guys I used the 5-second chalk. Obviously on DS you want a strong bias against answer choice E, especially on harder ones. This is because most people think logically and when their giving up and feel like theyâ€™re outclassed they choose E which is akin to the fold button. We need to be thinking one step ahead of the GMAT. Theyâ€™re banking on us doing what the majority of test takers would do. If theyâ€™re expecting us to fold we need to call. I would have a slight bias against C as well and usually pick A or B. Ok this is advanced but listen carefully. A GMAT problem is supposed to take you 2 minutes. Therefore if itâ€™s a long prompt and two pretty tough statements as in the aforementioned problem, probably one of the statements is going to be a bit easier to get through and the other is going to be tougher because after all if both statements were super hardâ€¦is it really solvable in 2 minutes? As a final bias I would choose whichever one looks harder because often times if you were to actually do the problem, the easier statement will pan out as insufficient way and the hard one will be sufficient in a way thatâ€™s hard for you to see or figure out. This is obviously not always going to be true but it is the percentage play.

Ok back to the test I was just in a zone and was basically right on pace effectively guessing and hanging as tough as I could. I finished just on time. As a final pointer on the math section to those of you trying to increase your score. Remember, I moved up from a 580 to a 700 so it was basically a completely different test. When I got the 580 I had racked up extra time and easily was able to finish so I spent it in the middle of the test. If youâ€™re looking for a Q49/Q50 you have to keep the big picture in mind. Assume your talent and that the questions are going to get tough, and really try to hold on to the extra time you bank early on in the 1st 10 questions. Once the test realizes youâ€™re a stud theyâ€™re going to try to take the hammer to you near the end and this is where you really need to try to have this time to use. So donâ€™t needlessly waste it like I did in the early/middle of the test because double checking a problem youâ€™re 90% sure of because that will hurt you later on down the road, those 4-5 minutes you saved up seems like a good chunk of change, but you can go broke quickly..This happened to me, the last 3 problems were really tough and to be honest on question #35 I started breaking down under the time pressure and couldnâ€™t think straight on a problem I felt I was supposed to get. I was really wishing I had been a bit more urgent earlier on as I was forced to basically guess on 36 and run a 1/3 on #37. I probably had a Q50 going into the last 3 problems and settled for a pretty sweet Q49.

~Brett

Learnist: How to Get Better Scores on LSAT Logical Reasoning

Logical reasoning, or LR, is one of three multiple choice questions on the LSAT. According to the official LSAT website, LSAC, questions test your ability to â€śanalyze, critically evaluate, and complete arguments.â€ť

An argument may be something you think of as occurring in politics (two sides arguing over an issue such as the payroll tax cut), or as part of a celebrity feud, but in LSAT terms, an argument is not a conflict at all.

An argument is simply a declarative statement backed up with examples. It can be as simple as, â€śOne Direction is my favorite boy-band because I like pop music.â€ť The conclusion is that this group is the authorâ€™s â€śfavoriteâ€ť and the evidence is that the author likes pop music. The assumption here is that One Direction is classified as pop music.

The LSAC states that there are ten concepts tested in Logical Reasoning:Recognizing the parts of an argument and their relationshipRecognizing similarities and differences between patterns of reasonin

• Drawing well-supported conclusions
• Reasoning by analogy
• Recognizing misunderstandings or points of disagreement
• Determining how additional evidence affects an argument
• Detecting assumptions made by particular arguments
• Identifying and applying principles or rules
• Identifying flaws in arguments
• Identifying explanations

According to this official LSAC site, the LSAT concepts will be based on a short passage accompanied by one (or occasionally two) multiple choice questions. The questions can ask about any part of the argument: the conclusion, the evidence, the assumptions, or it can ask how an outside piece of information relates to the argument (parallel reasoning, complete the passage, additional evidence, etc.)

While I don’t tutor the LSAT in its entirety, I have worked with LSAT students who need help with LSAT Logical Reasoning! Feel free to get some more free LSAT tips on this Learnboard.

Tough GMAT: Critical Reasoning Question of the Day!

From the evil geniuses at Manhattan GMAT, try this interesting CR question, the read the explanation below!

Scientists recently documented that influenza spreads around the world more efficiently in the modern era due to commercial air travel. Symptoms of a pandemic-level flu are severe enough that the ill would likely cancel or reschedule air travel, but an infected person can travel across the globe before the first signs appear. Further, if symptoms develop while someone is still on a plane, the infected person’s cough can spread the virus easily in the enclosed and closely packed environment.

Which of the following would best minimize the role air travel can play in the spread of influenza during a pandemic?

(A) installing air filtration systems in the planes to kill any flu virus particles flowing through the filters
(B) requiring air travelers to receive flu vaccinations far enough in advance of the trip to provide protection against the disease
(C) refusing to allow children, the elderly, or others who are especially vulnerable to flu to travel by air during a pandemic
(D) requiring all air travelers to wash their hands before boarding a plane
(E) conducting medical examinations during the boarding process to weed out passengers with flu symptoms

Explanation:

Conclusion: Influenza spreads more rapidly b/c of airplanes.

Evidence: Infected person can travel before symptoms appear & spread illness

Question Rephrase: How could air travel stop the spread of disease?

Prediction: If there was a way to make sure people who boarded were not ill, or if there was a way they couldn’t spread it once on the plane.

A – Yes, this stops the spread on the plane, but could still let the ill people fly
B – Yes, this stops the ill people from flying
C – No, this only stops certain ill people from flying
D – No, hand washing doesn’t prevent those already ill from flying
E – No, the passage states that people can travel before “first signs appear” so the examinations would likely be ineffective

Between A and B, my choice would be B since it prevents the ill from flying altogether and would therefore “best minimize.”

Remember that the correct answer is going to be the one based on the information from the passage. The passage only gave 2 pieces of evidence: (1) sick people travel before symptoms, and (2) sick people spread illness within the cabin.

Repeated vaccinations and whether a person would reschedule/cancel travel are two issues that are not mentioned and are entirely outside the scope of the passage. Be careful not to use outside information. Follow the logic of the passage.